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Telephone Two Inventors, Elisha Grey and Alexander Graham Bell, Independently Designed Devices to Transmit Electrically Speech (The Telephone)

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Telephone Two Inventors, Elisha Grey and Alexander Graham Bell, Independently Designed Devices to Transmit Electrically Speech (The Telephone) In 1825 William Sturgeon had exhibited the electro-magnet. In 1830 Joseph Henry showed how Sturgeon's device helped with long-distance communication to strike a bell. This was the beginning of the electric telegraph proper and it was exploited very successfully by Samuel F B Morse, who with Alfred Vail developed in 1838 a simple tap key through a series of dots and dashes now known as the Morse Code. Telegraph quickly spread across Europe and the USAand many improvements were developed over the century. http://en.wikipedia.org/wikilElectrical telegraph http://www.telegraph-office.com/ http://mysite.du.edu/'''jcalvert/tel/morse/morse.htm#C http://mysite.du.edu/'''jcalvert/tel/morse/morse.htm http://www.sparkmuseum.com/TELEGRAPH.HTM S'II""''lJAnD \\'1[U~Lm;~ I,"~. http://www.juliantrubin.com/bigten/morsetelegraph.html Telephone Two inventors, Elisha Grey and Alexander Graham Bell, independently designed devices to transmit electrically speech (the telephone). Bell won the race to patent the device. Competition is fierce as the following shows: • 11 February 1876 - Gray invents a liquid transmitter for use with a telephone but does not build one. • 14 February 1876 - Elisha Gray files a patent caveat for transmitting the human voice through a telegraphic circuit. • 14 February 1876 - Alexander 'Bell applies for the patent "Improvements in Telegraphy", for electromagnetic telephones using undulating currents. • 19 February 1876 - Gray is notified by the U.S. Patent Office of an interference between his caveat and Bell's patent application. Gray decides to abandon his caveat. • 7 March 1876 - Bellis U.S. patent 174,465 "Improvement in Telegraphy" is granted, covering "the method of, and apparatus for, transmitting vocal or other sounds telegraphically ... by causing electrical undulations, similar in form to the vibrations of the air accompanying the said vocal or other sound." • 10 Mar 1876 - First successful telephone transmission of clear speech using a liquid transmitter when Bell said, IIMr. Watson, come here, I want to see you." Watson heard every word. • 30 January 1877 - Bellis U.S. patent 186,787 is granted for an electromagnetic telephone using permanent magnets, iron diaphragms, and a call bell. • 27 April 1877 - Edison files for a patent on a carbon (graphite) transmitter. The patent 474,230 was granted 3 May 1892, after a 15 year delay because of litigation. Edison was granted patent 222,390 for a carbon granules transmitter in 1879. <http://en.wikipedia.org!wiki/Telephone> The rapid spread of use of this invention was astronomical and revolutionised trade nationally and internationally right into the zo" Century. Resources http://inventors.about.com/od/bstartinventors/a/telephone.htm http://en.wikipedia.org/wikilHistory of the telephone http://www.telephonymuseum.com/telephone%20history.htm http://www.britishtelephones.com/histuk.htm.
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